CN102358679B - Sludge conditioner, and deep dehydration method by using the same - Google Patents
Sludge conditioner, and deep dehydration method by using the same Download PDFInfo
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- CN102358679B CN102358679B CN201110279623.3A CN201110279623A CN102358679B CN 102358679 B CN102358679 B CN 102358679B CN 201110279623 A CN201110279623 A CN 201110279623A CN 102358679 B CN102358679 B CN 102358679B
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- sludge
- sludge conditioner
- conditioner
- mud
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Abstract
The invention belongs to the technical field of comprehensive utilization of solid waste, discloses a sludge conditioner, and a deep dehydration method by using the sludge conditioner. The sludge conditioner provided by the present invention comprises the following components, by weight, 30-60% of MgO, 20-40% of CaO and 20-30% of ash. The preparation method provided by the present invention comprises the following steps: grinding 40-70% by weight of magnesia and 30-60% by weight of limestone into powders, and mixing the powders; conveying the powders to a muffle furnace and burning for 1-2 hours at a temperature of 900-1000 DEG C; naturally cooling to the room temperature to prepare the sludge conditioner. The invention further discloses the deep dehydration method by using the sludge conditioner. The deep dehydration method comprises the following steps: adding the sludge conditioner to sludge, wherein the adding amount of the sludge conditioner is 5-30% of the dry weight of the sludge; stirring for 10-20 minutes; carrying out dehydration for the uniformly-stirred sludge. The sludge conditioner is nontoxic and harmless; with adopting the deep dehydration method by using the sludge conditioner, the water content in the sludge is rapidly reduced to less than 60%.
Description
Technical field
The invention belongs to solid waste comprehensive utilization technique field, relate to the deep dehydration method of a kind of sludge conditioner and use sludge conditioner.
Background technology
Mud is the thick material of one producing in sewage treatment process, and take aerobic, anaerobion as main body, organic content is higher, tightr with the combination of water.The water ratio of general Sewage Plant second pond mud is 97%～99%, and wherein interstitial water accounts for 70%, and capillary water accounts for 20% left and right, and planar water is about 7%, and in born of the same parents, water is about 3%.Sewage plant sludge is after precipitation and filter-press dehydration at present, and water ratio is 75%～85%, and now the water morphology in mud is mainly water in planar water and born of the same parents.Common pressure filter and centrifuge cannot carry out deep dehydration to this mud.The sludge volume of 80% left and right water ratio is larger, very easily corrupt, is difficult to transportation and subsequent disposal.Be mainly sludge curing and improve two aspects of pressure filter squeeze pressure for the research of deeply dehydrating sludge.
Chinese patent literature " efficient nano sludge dehydration conditioner " (publication number CN1621369A, June 1 2005 publication date), discloses a kind of ZShi efficient nano sludge dehydration conditioner.Compound weight is: 80～98 parts of inorganic polymer dehydrating and conditioning agent, 1～19 part of organic polymer dewatering agent, 0.5～6 part, hydroxyl methylcellulose sodium, 0.1～3.5 part of nano material.The object of this invention is to increase neutralising capacity and bridging ability and seepage force, makes the dehydration pretreating effect of mud good.But the object of its effect is mainly the interstitial water in mud, little to the deep dehydration effect of mud.
Chinese patent literature " a kind of inorganic composite conditioner and mud dewatering method thereof " (publication number CN101397181A, April 1 2009 publication date), a kind of inorganic composite conditioner of sludge dewatering is disclosed, comprise flyash and unslaked lime, dosage is 6%～20% of mud weight, after stirring, carry out mechanical dehydration, moisture content of the cake is 45%～60%.The Main Function mechanism of flyash is adsorption bridging, and unslaked lime plays Coagulation aiding, does not act on the interior water of born of the same parents of mud.
Chinese patent literature " mechanical dehydration treatment method for sludge modification " (application publication number CN101811814A, August 25 2010 publication date), a kind of mechanical dehydration treatment method for sludge modification is disclosed, in the former raw sludge that its step is is 80%～85% to water ratio, add dewatering agent, ferrous sulfate, lime, reodorant, then add the water of former raw sludge weight 30%～50%, stir into after mud and process with primary crusher, finally pump into filter-press dehydration in pressure filter, pressure is 10～14MPa.Moisture content of the cake is 50%～60%.The raw material relating in this patent is comparatively complicated, and mud after conditioning has relatively high expectations to the pressure of pressure filter, and the pressure of the existing pressure filter of current domestic Sewage Plant generally only can reach 2～3MPa, is therefore not suitable as the upgrading technique of sewage plant sludge processing.
Chinese patent literature " domestic sludge is amendment and Opsonizing method for dehydration " (application publication number CN101985386A, March 16 2011 publication date), one way of life conditioner for sludge dehydration is disclosed, formula comprises: the polyacrylamide that accounts for pending mud dry weight 0.3%～0.9%, account for the bamboo charcoal of pending mud dry weight 5%～20%, account for the quaternary ammonium salt of pending mud dry weight 0.2%～1%, account for the unslaked lime and the polyaluminium sulfate that accounts for pending mud dry weight 5%～20% of pending mud dry weight 2%～5%.Under normal temperature and pressure conditions, in pending mud, add successively described polyaluminium sulfate, unslaked lime and bamboo charcoal, stirring reaction adds described polypropylene phthalein amine and quaternary ammonium salt more successively after at least 5 minutes, stir at least 3 minutes, last press filtration.The raw material that this Opsonizing method relates to is more, and bamboo charcoal source is not extensive.Each composition Main Function mechanism in amendment is adsorption bridging and flocculation, can not really act on the interior water of born of the same parents of mud.
Summary of the invention
Large for prior art Chinese medicine addition, cannot act on the problems such as cell interior water, opsonization are not remarkable, the object of this invention is to provide a kind of sludge conditioner, that this amendment has is nontoxic, addition is less, can not cause to environment the advantages such as secondary pollution.
Another object of the present invention is to provide a kind of deep dehydration method that uses above-mentioned sludge conditioner, and the method is simple, and dehydration rate is high.
Technical scheme of the present invention is as follows:
The invention provides a kind of sludge conditioner, this sludge conditioner comprises following component and weight percentage:
MgO 30～60％，
CaO 20～40％，
Ash content 20～30%.
Described ash composition comprises silicon-dioxide, ferric oxide, potassium oxide, Vanadium Pentoxide in FLAKES and aluminium sesquioxide etc., and the weight percentage that each component accounts for sludge conditioner is followed successively by 10～28%, 0.1～1.5%, 1～5%, 1～8%, 0.1～1%.
The present invention also provides a kind of preparation method of above-mentioned sludge conditioner, and the method comprises the following steps:
The Wingdale that the magnesia that is 40～70% by weight percent is 30～60% with weight percent mixes after pulverizing, and sends into 900～1000 ℃ of calcination 1～2h in retort furnace, is naturally cooled to after room temperature, makes sludge conditioner.
The present invention also provides a kind of deep dehydration method that uses above-mentioned sludge conditioner, and the method comprises the following steps:
Sludge conditioner is joined in mud, and the quality percentage composition that sludge conditioner add-on accounts for mud dry weight is 5～30%, stirs 10～20min, and the mud stirring is dewatered.
Described moisture percentage in sewage sludge >=85%, as water ratio < 85% in mud, adding water to regulate makes its water ratio >=85%.
Described sludge dewatering is to adopt pressure filter to carry out mechanical dehydration.
Moisture content of the cake≤60% after described sludge dewatering.
Compared with the existing technology, tool has the following advantages and beneficial effect in the present invention:
1, inorganic chemistry amendment of the present invention is nontoxic, and addition is less, can not cause secondary pollution to environment.
2, the present invention to sludge conditioning modification after, water discharges in part born of the same parents, the capillary water absorbing time CST (capillary water absorbing time) of mud reduces by 50～90%, can press filtration performance greatly the improving of mud.
3, the present invention adopts pressure filter to carry out degree of depth filter-press dehydration to mud, makes, below moisture percentage in sewage sludge fast reducing to 60%, to have improved the processing efficiency of mud, is convenient to transportation and subsequent disposal and disposes.
4, the present invention adopts the conditioning filter-pressing process factory's mud of disposing of sewage, and only need simply transform existing sludge treatment structures and equipment, can greatly improve the dewatering efficiency of mud.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
Magnesia is taken from Chaohu, Anhui Province, China, and Wingdale is taken from Qingyang, anhui.
Embodiment 1
The Wingdale that the magnesia that is 40% by weight percent is 60% with weight percent mixes after pulverizing, send into 900 ℃ of calcination 1h in retort furnace, naturally be cooled to after room temperature, make sludge conditioner, adopt Xray fluorescence spectrometer to detect element wherein, in oxide compound, in amendment, MgO weight percent is 30%, CaO weight percent is 40%, and ash content weight percent is 30%.Ash content, in oxide compound, comprises silicon-dioxide (weight percent is 24%), ferric oxide (weight percent is 1%), potassium oxide (weight percent is 3.1%), Vanadium Pentoxide in FLAKES (weight percent is 1.5%), aluminium sesquioxide (weight percent is 0.4%).
The dewatered sludge water ratio of taking from Shanghai Sewage Plant is 77%, adds the water of mud weight 50%, conditioning of mud water ratio to 85%.Mix and account for the above-mentioned sludge conditioner that the quality percentage composition of mud dry weight is 20%.Stir after 15min, the capillary water absorbing time of mud can be reduced to 1154s by the 3762s of former raw sludge; Mud after conditioning is pumped into pressure filter and carry out mechanical dehydration, after squeezing pressurize 1.5h, moisture content of the cake is 57%.
Embodiment 2
The Wingdale that the magnesia that is 50% by weight percent is 50% with weight percent mixes after pulverizing, send into 1000 ℃ of calcination 1.5h in retort furnace, naturally be cooled to after room temperature, make sludge conditioner, adopt Xray fluorescence spectrometer to detect element wherein, in oxide compound, in amendment, MgO weight percent is 45%, CaO weight percent is 30%, and ash content weight percent is 25%.Ash content, in oxide compound, comprises silicon-dioxide (weight percent is 18%), ferric oxide (weight percent is 0.6%), potassium oxide (weight percent is 2.9%), Vanadium Pentoxide in FLAKES (weight percent is 3.2%), aluminium sesquioxide (weight percent is 0.3%).
The dewatered sludge water ratio of taking from Jiangyin printing and dyeing mill is 80%, adds the water of mud weight 30%, conditioning of mud water ratio to 85%.Mix and account for the above-mentioned sludge conditioner that the quality percentage composition of mud dry weight is 5%.Stir after 15min, the capillary water absorbing time of mud can be reduced to 321s by the 651s of former raw sludge; Mud after conditioning is pumped into pressure filter and carry out mechanical dehydration, after squeezing pressurize 45min, moisture content of the cake is 53%.
Embodiment 3
The Wingdale that the magnesia that is 70% by weight percent is 30% with weight percent mixes after pulverizing, send into 950 ℃ of calcination 2h in retort furnace, naturally be cooled to after room temperature, make sludge conditioner, adopt Xray fluorescence spectrometer to detect element wherein, in oxide compound, in amendment, MgO weight percent is 60%, CaO weight percent is 20%, and ash content weight percent is 20%.Ash content, in oxide compound, comprises silicon-dioxide (weight percent is 10%), ferric oxide (weight percent is 0.3%), potassium oxide (weight percent is 2.8%), Vanadium Pentoxide in FLAKES (weight percent is 6.7%), aluminium sesquioxide (weight percent is 0.2%).
The excess sludge water ratio of taking from Fuyang Sewage Plant second pond is 92%, mixes and accounts for the above-mentioned sludge conditioner that the quality percentage composition of mud dry weight is 30%.Stir after 15min, the capillary water absorbing time of mud can be reduced to 223s by the 467s of former raw sludge; Mud after conditioning is pumped into pressure filter and carry out mechanical dehydration, after squeezing pressurize 60min, moisture content of the cake is 55%.
Comparative example 1
The dewatered sludge water ratio of taking from Shanghai Sewage Plant is 77%, adds the water of mud weight 50%, conditioning of mud water ratio to 85%.Mix and account for the technical grade CaO (purity 85%) that the quality percentage composition of mud dry weight is 20%.Stir after 15min, the capillary water absorbing time of mud is increased to 4067s by the 3762s of former raw sludge.
Comparative example 2
The dewatered sludge water ratio of taking from Shanghai Sewage Plant is 77%, adds the water of mud weight 50%, conditioning of mud water ratio to 85%.Mix and account for the technical grade MgO (purity 85%) that the quality percentage composition of mud dry weight is 20%.Stir after 15min, the capillary water absorbing time of mud can be reduced to 3067s by the 3762s of former raw sludge.
Capillary water absorbing time in comparative example 1 after conditioning has increased 305s than the 3762s of former raw sludge, capillary water absorbing time in comparative example 2 after conditioning has only reduced by 18% than the 3762s of former raw sludge, both conditioning effects are all not as good as embodiment 1, the strainability of mud does not improve, and is difficult to realize follow-up filter-press dehydration.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.Person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not departing from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (5)
1. a sludge conditioner, is characterized in that: this sludge conditioner comprises following component and weight percentage:
MgO 30～60%，
CaO 20～40%，
Ash content 20～30%;
Described ash content comprises silicon-dioxide, ferric oxide, potassium oxide, Vanadium Pentoxide in FLAKES and aluminium sesquioxide, and the weight percentage that each component accounts for sludge conditioner is followed successively by 10～24%, 0.1～1.5%, 1～5%, 1～8%, 0.1～1%;
The preparation method of described sludge conditioner comprises the following steps:
The Wingdale that the magnesia that is 40～70% by weight percent is 30～60% with weight percent mixes after pulverizing, and sends into 900～1000 ℃ of calcination 1～2h in retort furnace, is naturally cooled to after room temperature, makes sludge conditioner.
2. the deep dehydration method of sludge conditioner according to claim 1, is characterized in that: the method comprises the following steps:
Sludge conditioner is joined in mud, and the quality percentage composition that sludge conditioner add-on accounts for mud dry weight is 5～30%, stirs 10～20min, and the mud stirring is dewatered.
3. the deep dehydration method of sludge conditioner according to claim 2, is characterized in that: described moisture percentage in sewage sludge >=85%.
4. the deep dehydration method of sludge conditioner according to claim 2, is characterized in that: described sludge dewatering is to adopt pressure filter to carry out mechanical dehydration.
5. the deep dehydration method of sludge conditioner according to claim 2, is characterized in that: moisture content of the cake≤60% after described sludge dewatering.
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| CN201110279623.3A CN102358679B (en) | 2011-09-20 | 2011-09-20 | Sludge conditioner, and deep dehydration method by using the same |
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| CN201110279623.3A CN102358679B (en) | 2011-09-20 | 2011-09-20 | Sludge conditioner, and deep dehydration method by using the same |
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| CN102358679B true CN102358679B (en) | 2014-05-21 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102964054B (en) * | 2012-12-07 | 2014-02-26 | 山西艾森资源综合利用技术研究院 | Rapid drying process for dewatered sludge |
| CN103113013B (en) * | 2013-02-01 | 2014-06-18 | 深圳市水务(集团)有限公司 | Compound type sludge dewatering conditioner and application method thereof |
| CN103626378A (en) * | 2013-10-31 | 2014-03-12 | 中国矿业大学 | Sludge composite conditioner and conditioning method using same |
| CN104803656B (en) * | 2015-02-14 | 2017-05-10 | 广州市正源环境工程有限公司 | Method used for preparing sintered bricks with modified sludge |
| CN104803567B (en) * | 2015-02-14 | 2017-01-25 | 广州市正源环境工程有限公司 | Sludge modifier, and method used for preparing subgrade soil from sludge via modification |
| CN105217926A (en) * | 2015-10-20 | 2016-01-06 | 盐城琛丹低碳技术研究院有限公司 | Sludge reduction method |
| CN105837005B (en) * | 2016-06-13 | 2018-05-25 | 山东省科学院能源研究所 | Municipal biological dewatered organic conditioner of excess sludge and preparation method thereof |
| CN106746483A (en) * | 2017-02-10 | 2017-05-31 | 周毅 | The agent of compound type sludge decrement, preparation method and applications |
| CN112429938A (en) * | 2020-10-27 | 2021-03-02 | 浙江中呈科技股份有限公司 | Deep dehydration method using sludge conditioner and equipment thereof |
| CN112774657B (en) * | 2020-12-28 | 2023-06-16 | 江苏新聚环保科技有限公司 | Catalyst for deodorizing activated sludge and method for deodorizing activated sludge and accelerating sludge precipitation |
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| US4539121A (en) * | 1984-01-18 | 1985-09-03 | Kapland Mitchell A | Bay mud stabilization |
| JP2004141774A (en) * | 2002-10-24 | 2004-05-20 | Kurita Water Ind Ltd | Method of purifying soil or deposited substance |
| CN100412014C (en) * | 2006-11-27 | 2008-08-20 | 武汉路德科技有限责任公司 | Sludge drying agent and its preparing method |
| CN101062824A (en) * | 2007-04-17 | 2007-10-31 | 同济大学 | Sludge gelling curing agent and application thereof |
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